Properly handle invalid boxes

lib/vagrant-lxc/action/handle_box_metadata.rb

@@ -9,31 +9,50 @@ module Vagrant
         end
 
         def call(env)
-          env[:ui].info I18n.t("vagrant.actions.vm.import.importing",
-                               :name => env[:machine].box.name)
+          @env = env
+          @box = @env[:machine].box
 
-          box = env[:machine].box
+          @env[:ui].info I18n.t("vagrant.actions.vm.import.importing",
+                                :name => @env[:machine].box.name)
 
-          template_src = box.directory.join('lxc-template').to_s
-          unless File.exists?(template_src)
-            raise Errors::TemplateFileMissing.new name: box.name
-          end
+          @logger.debug 'Validating box contents'
+          validate_box
 
-          # TODO: Validate box version
-
-          @logger.debug('Merging metadata with template name and rootfs tarball')
-
-          template_opts = box.metadata.fetch('template-opts', {}).dup
-          template_opts.merge!(
-            '--tarball'  => box.directory.join('rootfs.tar.gz').to_s,
-						'--auth-key' => Vagrant.source_root.join('keys', 'vagrant.pub').expand_path.to_s
-          )
-
-          env[:lxc_template_opts] = template_opts
-          env[:lxc_template_src]  = template_src
+          @logger.debug 'Setting box options on environment'
+          @env[:lxc_template_opts] = template_opts
+          @env[:lxc_template_src]  = template_src
 
           @app.call env
         end
+
+        def template_src
+          @template_src ||= @box.directory.join('lxc-template').to_s
+        end
+
+        def template_opts
+          @template_opts ||= @box.metadata.fetch('template-opts', {}).dup.merge!(
+            '--tarball'  => rootfs_tarball,
+            '--auth-key' => Vagrant.source_root.join('keys', 'vagrant.pub').expand_path.to_s
+          )
+        end
+
+        def rootfs_tarball
+          @rootfs_tarball ||= @box.directory.join('rootfs.tar.gz').to_s
+        end
+
+        def validate_box
+          if @box.metadata.fetch('version').to_i != 2
+            raise Errors::InvalidBoxVersion.new name: @box.name
+          end
+
+          unless File.exists?(template_src)
+            raise Errors::TemplateFileMissing.new name: @box.name
+          end
+
+          unless File.exists?(rootfs_tarball)
+            raise Errors::RootFSTarballMissing.new name: @box.name
+          end
+        end
       end
     end
   end

lib/vagrant-lxc/errors.rb

@@ -6,9 +6,17 @@ module Vagrant
       class ExecuteError < Vagrant::Errors::VagrantError
         error_key(:lxc_execute_error)
       end
+
+      # Box related errors
       class TemplateFileMissing < Vagrant::Errors::VagrantError
         error_key(:lxc_template_file_missing)
       end
+      class RootFSTarballMissing < Vagrant::Errors::VagrantError
+        error_key(:lxc_invalid_box_version)
+      end
+      class InvalidBoxVersion < Vagrant::Errors::VagrantError
+        error_key(:lxc_invalid_box_version)
+      end
     end
   end
 end

spec/unit/action/handle_box_metadata_spec.rb

@@ -1,6 +1,7 @@
 require 'unit_helper'
 
 require 'vagrant'
+require 'vagrant-lxc/errors'
 require 'vagrant-lxc/action/handle_box_metadata'
 
 describe Vagrant::LXC::Action::HandleBoxMetadata do
@@ -9,11 +10,13 @@ describe Vagrant::LXC::Action::HandleBoxMetadata do
   let(:machine)       { mock(:machine, box: box) }
   let(:box)           { mock(:box, name: 'box-name', metadata: metadata, directory: box_directory) }
   let(:box_directory) { Pathname.new('/path/to/box') }
-  let(:metadata)      { {'template-opts' => {'--foo' => 'bar'}} }
+  let(:version)       { '2' }
+  let(:metadata)      { {'template-opts' => {'--foo' => 'bar'}, 'version' => version} }
   let(:vagrant_key)   { Vagrant.source_root.join('keys', 'vagrant.pub').expand_path.to_s }
 
   subject { described_class.new(app, env) }
 
+  context 'with valid contents' do
     before do
       File.stub(exists?: true)
       subject.call(env)
@@ -39,3 +42,29 @@ describe Vagrant::LXC::Action::HandleBoxMetadata do
       env[:lxc_template_src].should == box_directory.join('lxc-template').to_s
     end
   end
+
+  describe 'with invalid contents' do
+    before { File.stub(exists?: true) }
+
+    it 'raises an error if the version is != 2' do
+      metadata['version'] = '1'
+      expect {
+        subject.call(env)
+      }.to raise_error(Vagrant::LXC::Errors::InvalidBoxVersion)
+    end
+
+    it 'raises an error if the rootfs tarball cant be found' do
+      File.stub(:exists?).with(box_directory.join('rootfs.tar.gz').to_s).and_return(false)
+      expect {
+        subject.call(env)
+      }.to raise_error(Vagrant::LXC::Errors::RootFSTarballMissing)
+    end
+
+    it 'raises an error if the lxc-template script cant be found' do
+      File.stub(:exists?).with(box_directory.join('lxc-template').to_s).and_return(false)
+      expect {
+        subject.call(env)
+      }.to raise_error(Vagrant::LXC::Errors::TemplateFileMissing)
+    end
+  end
+end